How solve mailto when user don't have mail client

When a user clicks on a mailto link and doesn't have a mail client installed or configured, the link won't work as expected. Here are a few ways to handle this situation:

Use a fallback email address: You can provide a fallback email address that the user can copy and paste into their email client. For example:
```
<a href="mailto:[email protected]?subject=Hello&body=Hello%20World">Contact us</a>
```
In this case, if the user doesn't have a mail client, they can copy the email address and paste it into their email client.
Use a web-based email form: You can create a web-based email form that allows users to send an email without needing a mail client. For example:
```
<form action="https://example.com/send-email" method="post">
<input type="text" name="subject" placeholder="Subject">
<textarea name="body" placeholder="Message"></textarea>
<input type="submit" value="Send">
</form>
```
In this case, when the user submits the form, you can use a server-side language like PHP or Node.js to send the email.

Use a JavaScript-based solution: You can use JavaScript to detect if the user has a mail client installed and configured. If they don't, you can provide a fallback solution. For example:

if (navigator.mimeTypes && navigator.mimeTypes["message/rfc822"]) {
// User has a mail client installed and configured
window.location.href = "mailto:[email protected]?subject=Hello&body=Hello%20World";
} else {
// User doesn't have a mail client installed or configured
alert("Please copy and paste the email address into your email client:");
alert("[email protected]");
}

In this case, if the user doesn't have a mail client, they'll see an alert box with the email address and can copy and paste it into their email client.

Use a third-party service: You can use a third-party service like Mailgun or Sendgrid to handle email sending. These services provide APIs that allow you to send emails programmatically, so you can create a web-based email form or use JavaScript to send the email.

Remember to always validate user input and sanitize any data that's sent to your server to prevent security vulnerabilities.

Mail Knowledge

How solve mailto when user don't have mail client